Electromagnet.



No. 668,257. Patented Feb. I9, |9ol.

G. L. FooTE.

ELECTBOMAGNET.

(Appliention led Oct. 19, 1900.) (No Model.)

UNITED STATES PATENT OFFICE.

GEORGE L. FOOTE, OF BROOKLYN, NEW YORK.

ELECTROMAG N ET.

SPECIFICATION forming part of Letters Patent No. 668,257, dated February 19, 1902i.. Application filed October 19, 1900. -Serial No. 353,561. (No model.)

T0 cir/ZZ whom, it may concern.:

Beit known that I, GEORGE L. FOOTE, a citizen of the United States, and a resident of Brooklyn, in the county of Kings and State of New York, have made certain new and useful Improvements in Electromagnets, of which the following is a specification.

My invention is an improvement in electromagnets, such as the sounders and .relays employed in the telegraph service.

My improvement consists in a means for adjusting the position of the armature without changing the position or stroke of the Vibratory bar employed.

I employ the usual arrangement of electromagnetic coils, limit-stops, and retractingspring, but attach the armature on the said bar adjustably. I prefer to pivot or hinge the armature and bar together. A spring is employed having a tendency to press the two parts or pieces in a Fixed direction, as toward each other, and an adjusting-screw is employed to separate the armature from the bar to whichitis hinged, pivoted, or attached, the screw acting against the spring-pressure.

The accompanying drawings illustrate my invention.

Figure l is an elevation 'of a main -line sounder containing my improvement. Fig. 2 is a plan view of the same. Fig. 3 is a sectional view of the vibrating bar with the armature adjustably attached to it. The section is taken on the line 4 4, Fig. 4. Fig. 4Y shows the under side ot' the same bar on the line 3 3, Fig. 3. Eig. 5 is a rear end View of the bar, showing the hinge connecting the armature and vibratory bar together.

I employ the usual arrangement of magnetcoils m, with suitable cores having poles like 3l. The coils are fIxed to a metallic base 2l', having four points of support, 24 25 26 27, integral therewith, constituting a soundingboard. The sounding-board 2l is fixed upon the hase board 20, and there are suitable screw-cups 32, connected, respectively, with the coil-terminals. On the sounding-board 2l are located the yoke 22 and the anvil 23. 'n is a vibratory lever having a trunnion t, workingin the adjustable screw-bearings 40 in the yoke 22. There is a limit-stop 131 on the lower side of the bar n and an adjustable upper limit-stop 30 in the anvil-piece 23. The means preferred by me for adjustably supporting the armature d consists of a supplemental piece 0, having a transverse pivot p con necting it with bar fn.. There is a flat steel spring 3 fixed to the bar n by means of a screw 4l. The spring engages the extremity of the piece o beyond its point ot` support and exerts a constant tendency to force the opposite end of 0, to which the armature a is fixed by means 'of a screw 42, toward the bar n. There is a set-screw l0, with a check-nut 11, passing through a screw-threaded'aperture in the piece 0. The screw l0 engagesasocket l2 in the bar n. It will thus be seen that while the spring s has a constant tendency to force the armature a toward the bar n the screw l0 Inay be changed in position to vary the extent of the separation between o and n, so that while the extent of the movement of bar n-that is, its length of stroke-may be maintained uniform and unchanged the distance of the armature Cl, from the poles 3l of the magnet m may be changed at pleasure by adjusting the screw 10. The retractingspring 50 is shown as a compression-spring located between the adj usting-screw 51 on a cross-bar 52, fixed to yoke 22, and a projecting point 53, iixed to the bar n.

What I claim, and desire to secure by Letters Patent, is-

l. In an electromagnet the combination of suitable electromagnetic coils, a vibrating bar, a retracting spring and limiting stops for said bar, a supplementary bar pivotally supported upon said Vibrating bar, an armature fixed thereto and means for varying the position of said armature with respect to said vibratory bar and the magnet-poles.

2. In an electromagnet the combination of suitable coils, a vibratory bar, a retractingspring and limit-stops therefor, a bar pivotedy to said vibratory bar, a spring acting to press said bars together, an armature xed upon the second-named bar and an adjusting device carried by one bar to limit the extent of separation of said bars.

3. In an electromagnetic sounder the combination of the coils, a vibratory bar having limiting-stops and a retracting-spring; an armature Inovably supported upon said bar, a spring pressing said armature in one fixed direction and an adjustable contact carried by one of said bars to limit the extent of separation of said armature and bar.

GEORGE L. FOOTE.

Witnesses C. E. DAVIDSON, A. M. DONLEVY.

IOO 

